What an Economist dataset can honestly carry
Big Mac index records carry the date, ISO country code, currency code, country name, local price, dollar exchange rate, dollar price, the raw valuation against the dollar, euro, pound, yen and yuan, the GDP-based adjustment, the adjusted price and the adjusted valuations - exactly as published.
We keep the published values rather than recomputing them. The methodology is public and could be reproduced, but a recomputed index is our number, not The Economist's, and the difference matters to anyone citing it.
Where a client licenses Economist content, article records carry the headline, section, issue date, byline where given and article identifier, within the licence's scope and with its reference on every row.
Citation records, built without the site, show where other outlets cite Economist analysis.
Every row carries the collection timestamp and its source type.